DataGridControllers = {
  registerController: function (controller) {
    this._controllers.set(controller.getDataType(), controller);
  },
  getController: function (dataType) {
    return this._controllers.get(dataType);
  },
  EDITMODE_EDITABLE: 0,
  EDITMODE_NOT_EDITABLE: 1, 
  EDITMODE_ONLY_EDITABLE: 2,
  _controllers: new Hash()  
};